Market Sizing sources/research methodologies? Tons of garbage online from places like Business Research Insights

I’m doing some research for a PHD dissertation and am looking for market sizing data on the advertising industry and some subsectors of the industry. Most of the market sizing data online is from bogus research firms like “Business Research Insights” and “Verified Market Reports”.

I have been combing through sources like consulting firm reports, industry publications, but haven’t had much luck.

Industry of interest: Advertising

Does anyone have any good sources for this stuff?

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